Sulphur chloride reaction product



PM Feb. 1, 1933 UNITED ST TES PATENT "or-Pics WILLIAI 8. OALOOTT, 01' P311118 GROVE, NEW JERSEY, AND AL BERT 8. CARTER, OI WILIIIG'ION, DELAWARE, ASSIGNOBS '10 E. I. DU PORT DE NEKOUBS & comm, OI wrmrmwron, DELAWARE, A GORPOBATION OF DELAWARE SULPHUR CHIDBIDE REACTION IRODUCT 10 Drawing. Application fled June 1, 1829, Serial Io. 867,88}. Renewed April I, 1088.

Thisinventiori relates to a new class of roducts prepared from polymers of acetyene. More particularly, it relates to a process for reacting acetylene polymers with sulphur chloride to produce products of novel chemical constitution and characteristics process is returned to the catalyst mixture which is then ready for retrea-tment with acetylene. The ma'or product is a low boiling (SO- C.) highly unsaturated oil, called divinylacetylene and having most probably the empirical formula C.H., but there is also produced at the same time a substantial quantity of other polymerizable polymers of acetylene. Among these may be mentioned a polymer havin most probably the empirical formula C 8 and, therefore, a tetramer of acetylene, and a polymer believed to have the formula CJ-L. These productes may be re hly separated by distillation.

urther, it has been shown that the mixture obtained as above, or the separated constitu-.

ents thereof, under the influence of heat or by aging at ordina temperatures, in the presence of air er polymerize successively to an oily, then to a gelatinous, then to a resinous mass and finally yield a hard brittle resin having unusual resistance to the action of water and or ic solvents. The oily product which is lg: formed is largely so u 1c in alcohol and acetone; thegelatinous polymer modification next formed is largely soluble in acetone but artly insoluble in alcohol; the resinous mod fication next formed is substantially insoluble in alcohol and slightl soluble in acetone, while the subsequent har brittle polymers are substantially insoluble in both alcohol and acetone. It will be understood that these succemive polymerization products consist of a mixture of volatile and non-volatile compounds in various stages of polymer:-

or a mixture of the liquid acetylene polymers described above or a solution of either the solid or liquid polymers are caused to react with sulphur chloride, preferably under controlled conditions of temperature and/or solution, to obtain a new class of compounds.

In order to disclose the detailed preparation of the new materials the following s ific examples are furnished by way of ustration.

Example 1 parts (by volume) of the acetylene polymer thought to be divinylacetylene is slowly treated with sulphur chloride at room temperature until" reaction starts. The mixture is then cooled with a salt-ice mixture to control its violence while more sulphur chloride is added until 80 parts have been added inall. When the reaction has ceased, it is warmed to 100 C. giving a dark semi-plastic tar, which is in part, soluble in carbon disulphide and insoluble in water and alcohol.

7 Example 2 100 parts (by volume) of the liquid acetylene. polymer mixture comprising acetylene and parts (by volume) of carbon tetrachloride are treated with 100 parts of sulphur chloride. The mixture is warmed Emple 8 parts of a liquid acetylene polymer of no divmyl- -brown viscous liquid which upon drying in air forms a hard dry brittle solid film.

Ewample 4 Divinylacetylene is heated for approximately 5 hours at a temperature of approximately 85 C. in the absence of air. The product is diluted with 2 volumes of acetone which causes a precipitate of tackyrubberlike consistency to separate from the solution. This is separated by decantation and a portion dissolved in benzene,s01vent naphtha, or other suitable solvent. The solution is then treated with sulphur chloride in amount equal to about 1% of the weight of dissolved material. If desired the solvent may be evaporated from the sulphur chloride product, leaving it in the form of a thermoplastic solid.

As will appear from the above examples the liquid acetylene polymers may be treated directly with sulphur chloride; or they, or the soluble solid polymers as 'well, may be first dissolved in some unreactive sovent such 1 as carbon tetrachloride or benzene, and then '35 treated with sulphur chloride. It is therefore to beunderstood that where the term liquid acetylene polymer is employed it is intended to denote either a normally liquid polymer or a polymer contained in solution. Alternatively, the sulphur chloride may be in solution in a solvent for the reaction product and be added to the acetylene polymer which may or ma not be in a liquid state. To avoid a reaction with explosive violence, the temperature must be controlled and the use of a solvent in conjunction with cooling insures ample control. In the absence of a solvent, cooling in ice may become necessary and the addition of sulphur chloride should be slow. a

The sulphur chloride may be added to the acetylene polymers in almost any proportion depending upon the nature of the final product desired. Whenadded to the normally liquid polymers, the resultin product is apparently a mixture which, epending upon the amount of sulphur chloride reaction product present in roportion to the unreacted polymer, may be either in the form of a liquid or a solid. Thus, in general, if a large proportion of sulfur chloride is added to a normally liquid polymer, the resulting product will be in the form of a solid due to the predominance of the solid reaction product. The brittleness of this solid will be increased with an increase in the proportion of solid is obtained.

A product of similar properties may be obtained by adding sulphur chloride to a solution of an acetylene polymer in an added volatile solvent and removing the solvent by heating as disclosed in Examples 2 and 4. These solid products may be recognized as a brown or black thermoplastic material varying from a gummy tar to a brittle solid, depending upon the quantities of sulphur chloride and polymer employed. This product has been found to consist of a mixture, the major portion of which is insoluble in benzene, carbon tetrachloride, alcohol, water, acetone and similar solvents. It is partially soluble in carbon bisulphide; cold sulphuric acid has little effect upon it, but hot concentrated sulphuric acid causes decomposition; hot 10 N sodium hydroxide removes a part of the chlorine contained in this material, leaving a substance of similar properties. It also possesses valuable adhesive properties in addition to non-reactivity and insnlnbility.

By reason of these unusual properties, this material has been found suitable for use in a variety of industrial applications as, for example, in the preparation of hot and cold molding compositions.

Decrease in the proportion of sulphur chloride added to the normally liquid polymer below about 40% results in further lowering the viscosity of the product. When about 5% of sulphur chloride is added to the normal] liquid polymer the resulting product is obtained in the form of a liquid.

A H uid of similar properties may be prepared y dissolving a soluble solid polymer (obtained as illustrated in Example 4:) or a normally liquid polymer in an added solvent for the reaction product and then treating with the surphur chloride. The'concentration of the reaction product in such a liquid may obviously be controlled by the concentration of the polymer solution and by the quantityof sulphur chloride added and a solution of the desired properties thus obtained for direct use. Thus, whether the reaction product is obtained dissolved in an excess of the liquid polymer by adding small amounts of sulphur chloride to the undiluted polymer or is obtained in solution in an added volatile solvent, the resulting liquids are adapted for use in coatin compositions and yield hard resistant lms when spread upon a surface exposed to the air.

It would appear that the liquid products so obtained are probably merely solutions of the solid reaction product in either the unreacted liquid polymer or the added solvent.

The ultimate roduch; obtnined by at!- rating the acety ene pol with sulphur chloride esaen flue same physical properties irrespective o the Id. 5 However, the prorerties vary '1 indsxlijlphur chlori e content (l8 an y using more highly ymennd el. lene, a greater variety org mduds may obtained, owing to the greater variation possible before saturation 1s reached.

As many a parently widely dilerent unbodiments 0 this invention may be made withoutde from the spirit fllleof, it 5 b 31? de seves tot e oregoing or 'ption except as indicated in the following patent claim We claim .able '1. As a new compound, the reaction plodnold net of a nonbenzenoid polymaof ceetylme with sulphur chloride.

2. As a new com: und, rueh'm productofaliuidnon dncetylmepdymer with gmlphur chloride.

' 3.Asanewcompound,therecdim net of a nonbenzenoid' acetylene andsulhurchlorideintbepraeneeofa solvent or the reaction product of the dis of non-reactive volatile solvults 1 and liquid acetylene polymers.

4. Ascnew compound,asolutimofflle reaction product of a n polymer of acetylene and sulphur chlmride.

5. A new product obtninnble by reacting a normally M I H. polymer with oztoaoxof M chloride, besedontheweightofthepolyner.

mm 1! over 5% of theweightoffllem.

icighto aulphurehlnride.

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